Mason Machine Works Glass Plate Negatives, 6772 GPN, Box: 1; Box: 2. Kheel Center for Labor-Management Documentation & Archives.
Mason Machine Works Glass Plate Negatives, 6772 GPN, Box: 1; Box: 2. Kheel Center for Labor-Management Documentation & Archives. https://aspace3-test.library.cornell.edu/repositories/4/resources/13213 Accessed October 08, 2025.